Mahala, the bookshelf has been merged with your "books to be reposted" list. You can read up on this and several other new changes by holding your mouse over the Help Center in the grey bar above and click the Browse Docs in the drop down. Once the page loads, click "What's New" and then "New Features". The bottom ones are the newest ones, and one of them is on the upgrade to the bookshelf. Feel free to PM your own Tour Guide, or any Tour Guide listed in the Live Help section, if you still have questions after reading these sections.